diff options
Diffstat (limited to 'chromium/third_party/ffmpeg/libavformat/dsfdec.c')
| -rw-r--r-- | chromium/third_party/ffmpeg/libavformat/dsfdec.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/chromium/third_party/ffmpeg/libavformat/dsfdec.c b/chromium/third_party/ffmpeg/libavformat/dsfdec.c new file mode 100644 index 00000000000..ae198b2e93b --- /dev/null +++ b/chromium/third_party/ffmpeg/libavformat/dsfdec.c @@ -0,0 +1,159 @@ +/* + * DSD Stream File (DSF) demuxer + * Copyright (c) 2014 Peter Ross + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/intreadwrite.h" +#include "avformat.h" +#include "internal.h" +#include "id3v2.h" + +typedef struct { + uint64_t data_end; +} DSFContext; + +static int dsf_probe(AVProbeData *p) +{ + if (p->buf_size < 12 || memcmp(p->buf, "DSD ", 4) || AV_RL64(p->buf + 4) != 28) + return 0; + return AVPROBE_SCORE_MAX; +} + +static const uint64_t dsf_channel_layout[] = { + 0, + AV_CH_LAYOUT_MONO, + AV_CH_LAYOUT_STEREO, + AV_CH_LAYOUT_SURROUND, + AV_CH_LAYOUT_QUAD, + AV_CH_LAYOUT_4POINT0, + AV_CH_LAYOUT_5POINT0_BACK, + AV_CH_LAYOUT_5POINT1_BACK, +}; + +static void read_id3(AVFormatContext *s, uint64_t id3pos) +{ + ID3v2ExtraMeta *id3v2_extra_meta = NULL; + if (avio_seek(s->pb, id3pos, SEEK_SET) < 0) + return; + + ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, 0); + if (id3v2_extra_meta) + ff_id3v2_parse_apic(s, &id3v2_extra_meta); + ff_id3v2_free_extra_meta(&id3v2_extra_meta); +} + +static int dsf_read_header(AVFormatContext *s) +{ + DSFContext *dsf = s->priv_data; + AVIOContext *pb = s->pb; + AVStream *st; + uint64_t id3pos; + unsigned int channel_type; + + avio_skip(pb, 4); + if (avio_rl64(pb) != 28) + return AVERROR_INVALIDDATA; + + /* create primary stream before any id3 coverart streams */ + st = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + + avio_skip(pb, 8); + id3pos = avio_rl64(pb); + if (pb->seekable) { + read_id3(s, id3pos); + avio_seek(pb, 28, SEEK_SET); + } + + /* fmt chunk */ + + if (avio_rl32(pb) != MKTAG('f', 'm', 't', ' ') || avio_rl64(pb) != 52) + return AVERROR_INVALIDDATA; + + if (avio_rl32(pb) != 1) { + avpriv_request_sample(s, "unknown format version"); + return AVERROR_INVALIDDATA; + } + + if (avio_rl32(pb)) { + avpriv_request_sample(s, "unknown format id"); + return AVERROR_INVALIDDATA; + } + + channel_type = avio_rl32(pb); + if (channel_type < FF_ARRAY_ELEMS(dsf_channel_layout)) + st->codec->channel_layout = dsf_channel_layout[channel_type]; + if (!st->codec->channel_layout) + avpriv_request_sample(s, "channel type %i", channel_type); + + st->codec->codec_type = AVMEDIA_TYPE_AUDIO; + st->codec->channels = avio_rl32(pb); + st->codec->sample_rate = avio_rl32(pb) / 8; + + switch(avio_rl32(pb)) { + case 1: st->codec->codec_id = AV_CODEC_ID_DSD_LSBF_PLANAR; break; + case 8: st->codec->codec_id = AV_CODEC_ID_DSD_MSBF_PLANAR; break; + default: + avpriv_request_sample(s, "unknown most significant bit"); + return AVERROR_INVALIDDATA; + } + + avio_skip(pb, 8); + st->codec->block_align = avio_rl32(pb); + if (st->codec->block_align > INT_MAX / st->codec->channels) { + avpriv_request_sample(s, "block_align overflow"); + return AVERROR_INVALIDDATA; + } + st->codec->block_align *= st->codec->channels; + avio_skip(pb, 4); + + /* data chunk */ + + dsf->data_end = avio_tell(pb); + if (avio_rl32(pb) != MKTAG('d', 'a', 't', 'a')) + return AVERROR_INVALIDDATA; + dsf->data_end += avio_rl64(pb); + + return 0; +} + +static int dsf_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + DSFContext *dsf = s->priv_data; + AVIOContext *pb = s->pb; + AVStream *st = s->streams[0]; + int64_t pos = avio_tell(pb); + + if (pos >= dsf->data_end) + return AVERROR_EOF; + + pkt->stream_index = 0; + return av_get_packet(pb, pkt, FFMIN(dsf->data_end - pos, st->codec->block_align)); +} + +AVInputFormat ff_dsf_demuxer = { + .name = "dsf", + .long_name = NULL_IF_CONFIG_SMALL("DSD Stream File (DSF)"), + .priv_data_size = sizeof(DSFContext), + .read_probe = dsf_probe, + .read_header = dsf_read_header, + .read_packet = dsf_read_packet, + .flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK, +}; |